(1)更新資料
(2)刪除資料
(1)更新資料
mysql中使用update語句更新表中的記錄，可以更新特定的行或者同事更新所有的行，基本語法如下：
update table_name
set column_name1 = value1,column_name2 = value2,..
...,column_namen = valuen
where
(condition)
;
mysql>
update person
->
set age =
15,name =
'liming'
->
where id =11;
query ok,
1row affected (
0.05 sec)
rows
matched: 1 changed: 1
warnings: 0
mysql>
select
*from person where id =11;
+----+--------+------+---------+
| id | name | age | info |
+----+--------+------+---------+|11
| liming |
15| student |
+----+--------+------+---------+
1row
inset
(0.00 sec)
mysql>
select
*from person where age between
19and22;
+----+---------+------+------------+
| id | name | age | info |
+----+---------+------+------------+|1
| green |
21| lawyer ||2
| suse |
22| dancer ||4
| willam |
20| sports man ||7
| dale |
22| cook ||9
| harry |
21| magician ||10
| harriet |
19| pianist |
+----+---------+------+------------+
6rows
inset
(0.00 sec)
mysql>
update person
set info=
'student'
where age between
19and22;
query ok,
0rows affected (
0.00 sec)
rows
matched: 0 changed: 0
warnings: 0
mysql>
select
*from person where age between
19and22;
+----+---------+------+---------+
| id | name | age | info |
+----+---------+------+---------+|1
| green |
21| student ||2
| suse |
22| student ||4
| willam |
20| student ||7
| dale |
22| student ||9
| harry |
21| student ||10
| harriet |
19| student |
+----+---------+------+---------+
6rows
inset
(0.00 sec)
從資料表刪除資料使用delete語句，允許使用where子句指定刪除條件。delete語句的基本語法格式如下;
delete
from table_name [
where
< condition>
]
mysql>
select*-
>
from person
->
where id =11;
+----+--------+------+---------+
| id | name | age | info |
+----+--------+------+---------+|11
| liming |
15| student |
+----+--------+------+---------+
1row
inset
(0.00 sec)
mysql>
delete
from person
->
where id =11;
query ok,
1row affected (
0.05 sec)
mysql>
select*-
>
from person
->
where id =11;
empty set
(0.00 sec)
mysql>
select
*from person where age between
19and22;
+----+---------+------+---------+
| id | name | age | info |
+----+---------+------+---------+|1
| green |
21| student ||2
| suse |
22| student ||4
| willam |
20| student ||7
| dale |
22| student ||9
| harry |
21| student ||10
| harriet |
19| student |
+----+---------+------+---------+
6rows
inset
(0.00 sec)
mysql>
delete
from person where age between
19and22;
query ok,
6rows affected (
0.05 sec)
mysql>
select
*from person where age between
19and22;
empty set
(0.00 sec)
mysql>
select
*from person;
+----+---------+------+-----------+
| id | name | age | info |
+----+---------+------+-----------+|3
| mary |
24| musician ||5
| laura |25|
null||
6| evans |
27| secretary ||8
| edison |
28| singer ||12
| beckham |
31| police |
+----+---------+------+-----------+
5rows
inset
(0.00 sec)
mysql>
delete
from person;
query ok,
5rows affected (
0.05 sec)
mysql>
select
*from person;
empty set
(0.00 sec)
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